CSS bottom

<!doctype html>
<title>Example</title>
<style>
div.inner {
  width: 200px;
  height: 100px;
  padding: 20px;
  border: 1px solid orange;
  position: absolute;
  bottom: 20px;
  }
</style>
<div class="inner">This 'div' is positioned using the CSS bottom property. Try changing the values to see the effect it has on the position of the div.</div>

The CSS bottom property specifies how far a box's bottom margin edge is offset above the bottom edge of the box's containing block.

The property allows you to specify how far the element is offset from the bottom edge of its containing block (for absolute positioning), or from where the positioned element's bottom edge would normally have been (for relative positioning). If it's a stickily positioned box, the bottom property's value is used to compute the sticky-constraint rectangle.

The bottom property is used in conjunction with the position property when its value is anything other than static.

Also see the top, left, and right properties.

Syntax

These values are explained below.

Possible Values

auto

Specifies the following:

for absolutely positioned elements, the position of the element is based on the top property, and height: auto will be treated as a height based on the content.
for relatively positioned elements, the offset the element from its original position is based on the top property, or if the value of top is also auto, no offset occurs at all.

percentage

Specifies the offset as a percentage. The offset is a percentage of the containing block's height. For stickily positioned elements, the offset is a percentage of the flow root's height. Negative values are allowed.

length

Specifies the offset as a length. The offset is a fixed distance from the reference edge. Negative values are allowed.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial: Represents the value specified as the property's initial value.
inherit: Represents the computed value of the property on the element's parent.
unset: This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

General Information

Initial Value: auto
Applies To: Positioned elements.
Inherited?: No
Media: Visual
Animatable: Yes (see example)

Example Code

Official Specifications

CSS Positioned Layout Module Level 3 (W3C Working Draft)
CSS Level 2.1 (W3C Recommendation 07 June 2011)

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